Abstract #1173

Towards Higher Spatial Resolution Echo-Planar-Imaging With A Compact Head 3T System

Ek T Tan¹, Seung-Kyun Lee¹, Paul Weavers², Matthew Middione³, Matt A Bernstein², John Huston², and Thomas KF Foo¹

¹GE Global Research, Niskayuna, NY, United States, ²Mayo Clinic, Rochester, MN, United States, ³GE Healthcare, Menlo Park, CA, United States

It is challenging to increase spatial resolution (≤1.5 mm) in whole-brain, single-shot echo-planar-imaging (ss-EPI) on conventional whole-body systems due to EPI distortion and limited SNR. A compact head 3T system with an asymmetric head gradient coil capable of high gradient amplitude and 3.5 times the slew rate of whole-body systems can enable ss-EPI acquisition with high spatial resolution and reduced spatial distortion, simultaneously. This work compares spin-echo and gradient-recalled-echo ss-EPI between the compact and whole-body systems, showing substantially reduced distortion and signal dropout, and shorter echo-times. Results with the high performance gradient were also demonstrated in multi-band-accelerated, high b-value diffusion-imaging.

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